Closing control method of high voltage DC circuit breaker

摘要

The present invention relates to a method for controlling the closing of a high voltage DC circuit breaker. In the above method, the blocking units of the blocking branch 2 are first turned on for each group, then the on-state branch 1 is turned on, and finally the blocking branch is closed. In the process of turning on the blocking units of the blocking branch for each group, it is determined whether or not a failure of the power transmission system has occurred after conducting the blocking units of the current group. If no failure occurs, continue to conduct the next group of blocking units, but continue to perform the next operation after all blocking units of all groups are turned on, and in the event of a failure, all groups are connected to the disconnected units. Block and end the closing operation. In the above method, the power transmission system can be charged in advance during the closing process of the high voltage DC circuit breaker, thereby reducing overvoltage generated in the closing operation and oscillation of the system.